CN115914596A - Projection equipment and display method of projection image thereof - Google Patents
Projection equipment and display method of projection image thereof Download PDFInfo
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Abstract
The application discloses a projection device and a display method of a projection image thereof, which are applied to a display control circuit of the projection device. The display control circuit is capable of dividing a projection image to be displayed into a first sub-image group and a second sub-image group and inverting the first sub-image group. Then, the display control circuit can read the pixels in each sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data, and synchronously read the pixels in each sub-image in the second sub-image group line by line to obtain second display data. Since the display control circuit can read the pixels of each sub-image in the first sub-image group and the second sub-image group at the same time, the efficiency of reading the pixels by the display control circuit is high. Based on this, the efficiency of the digital micro-mirror device for modulating the image light beam based on the first display data and the second display data is higher.
Description
Technical Field
The present disclosure relates to projection display technologies, and in particular, to a projection device and a method for displaying a projection image thereof.
Background
Laser projection devices typically include a laser light source, a light valve, a projection lens, and a projection screen. The projection system comprises a laser light source, a light valve, a projection lens and a projection screen, wherein the laser light source is used for providing laser beams, the light valve is used for modulating the laser beams into image beams (namely images to be projected and displayed), and the projection lens is used for projecting the image beams onto the projection screen.
In the related art, a Digital Micromirror Device (DMD) is integrated in the light valve. The DMD can modulate light beams emitted by the light source to obtain an image to be projected and displayed.
However, the DMD has low efficiency in modulating the image beam.
Disclosure of Invention
The application provides a projection device and a display method of a projection image thereof, which can solve the problem of low efficiency of DMD modulation of image light beams in the related art. The technical scheme is as follows:
in one aspect, a method for displaying a projected image is provided, which is applied to a display control circuit of a projection device, and the projection device further includes a digital micromirror device, where the digital micromirror device includes at least one first micromirror array and at least one second micromirror array; the method comprises the following steps:
dividing a projection image to be displayed into a first sub image group and a second sub image group which are arranged along the column direction, wherein the first sub image group comprises at least one sub image which is in one-to-one correspondence with at least one first micro mirror array, the second sub image group comprises at least one sub image which is in one-to-one correspondence with at least one second micro mirror array, each sub image comprises a plurality of rows of pixels, and the row numbers of the plurality of rows of pixels are increased row by row along the direction far away from the origin of an image coordinate system where the projection image is located;
turning the first sub image group by taking an axis parallel to the row direction as a turning axis, wherein the first sub image group is close to the origin of the image coordinate system relative to the second sub image group;
reading the pixels in at least one sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data;
in the process of reading the pixels in the first sub-image group line by line, reading the pixels in at least one sub-image in the second sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain second display data;
and transmitting the first display data to the at least one first micro mirror array, and transmitting the second display data to the at least one second micro mirror array, so that the digital micro mirror device modulates the projection image into an image beam.
In another aspect, a projection device is provided, the projection device comprising display control circuitry and a digital micromirror device comprising at least one first micromirror array, and at least one second micromirror array; the display control circuit is configured to:
dividing a projection image to be displayed into a first sub image group and a second sub image group which are arranged along the column direction, wherein the first sub image group comprises at least one sub image which is in one-to-one correspondence with at least one first micro mirror array, the second sub image group comprises at least one sub image which is in one-to-one correspondence with at least one second micro mirror array, each sub image comprises a plurality of rows of pixels, and the row numbers of the plurality of rows of pixels are increased row by row along the direction far away from the origin of an image coordinate system where the projection image is located;
turning the first sub image group by taking an axis parallel to the row direction as a turning axis, wherein the first sub image group is close to the origin of the image coordinate system relative to the second sub image group;
reading the pixels in at least one sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data;
in the process of reading the pixels in the first sub image group line by line, reading the pixels in at least one sub image in the second sub image group line by line along the sequence of the line numbers of the pixels from small to large to obtain second display data;
and transmitting the first display data to the at least one first micro mirror array, and transmitting the second display data to the at least one second micro mirror array, so that the digital micro mirror device modulates the projection image into an image beam.
In yet another aspect, a projection apparatus is provided, the projection apparatus comprising: a memory, a processor and a computer program stored on the memory, the processor implementing the method of displaying a projected image as described above when executing the computer program.
In yet another aspect, a computer-readable storage medium having instructions stored therein is provided, the instructions being loaded and executed by a processor to implement the method of displaying a projected image as described in the above aspect.
In a further aspect, there is provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the method of displaying a projected image as described in the preceding aspect.
The beneficial effect that technical scheme that this application provided brought includes at least:
the application provides a projection device and a display method of a projection image thereof, which are applied to a display control circuit of the projection device. The display control circuit is capable of dividing a projection image to be displayed into a first sub-image group and a second sub-image group and inverting the first sub-image group. Then, the display control circuit can read the pixels in each sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data, and synchronously read the pixels in each sub-image in the second sub-image group line by line to obtain second display data. Since the display control circuit can read the pixels of each sub-image in the first sub-image group and the second sub-image group at the same time, the efficiency of reading the pixels by the display control circuit is high. Based on the first display data and the second display data, the efficiency of modulating the image light beam by the digital micro-mirror device is higher.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present application;
fig. 3 is a schematic flowchart of a display method of a projection image according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a projection device displaying a projected image according to an embodiment of the present disclosure;
FIG. 5 is a schematic flowchart of another method for displaying a projected image according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a projection apparatus provided in an embodiment of the present application to divide an initial projection image;
fig. 7 is a schematic diagram of another projection apparatus provided in the embodiment of the present application to divide an initial projection image.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application. Referring to fig. 1, the projection apparatus may include: the multimedia processing circuit 10, the display control circuit 20, the light source driving circuit 30, the light source module 40, the light valve 50, and the projection lens 60.
Referring to fig. 1, the multimedia processing circuit 10 is connected to a display control circuit 20, and the multimedia processing circuit 10 is configured to receive an initial projection image through various types of communication interfaces and process the initial projection image (e.g., decoding process, feature extraction, brightness process, sharpness process, color process, etc.). The multimedia processing circuit 10 may then transmit the processed initial projected image to the display control circuit 20 in the form of a signal for the high definition digital display interface V-by-one. The multimedia processing circuit 10 may include a system on chip (SoC), among others.
The display control circuitry 20 is capable of decoding and format converting the received initial projection image and further processing (e.g., geometric correction processing) the initial projection image. The display control circuitry 20 may then transmit the processed initial projected image to the light valve 50 in the form of display data. The display control circuit 20 can also output a light source drive signal to the light source drive circuit 30 based on the initial projection image. The display control circuit 20 may include an Application Processor (AP) and a Digital Light Processing (DLP) control circuit.
The light source driving circuit 30 is configured to receive a light source driving signal and output a driving current to the light source assembly 40 based on the light source driving signal, so as to drive the light source in the light source assembly 40 to emit light. The light source in the light source assembly 40 may be a laser light source. Accordingly, the projection device may be a laser projection device. Alternatively, the light source in the light source assembly 40 may be another type of light source such as a light-emitting diode (LED).
The light valve 50 may be a digital micro mirror device (DMD). The dmd is capable of modulating a light beam emitted from the light source assembly 40 based on the received initial projected image to obtain an image light beam.
Alternatively, the digital micromirror device may include a plurality of micromirror arrays, and the display control circuit 20 may include a plurality of DLP control circuits in one-to-one correspondence with the plurality of micromirror arrays. For example, referring to fig. 2, the digital micromirror device may include 4 micromirror arrays, and the display control circuit 20 may also include 4 DLP control circuits in one-to-one correspondence with the 4 micromirror arrays.
In the embodiment of the present application, each DLP control circuit in the plurality of DLP control circuits can control its corresponding one of the micromirror arrays to modulate the image light beam. Thereby, the partitioning control of the digital micromirror device can be achieved. For example, referring to FIG. 2, a first DLP control circuit can control the micromirror array LT to modulate an image beam, a second DLP control circuit can control the micromirror array RT to modulate an image beam, a third DLP control circuit can control the micromirror array LB to modulate an image beam, and a fourth DLP control circuit can control the micromirror array RB to modulate an image beam.
Optionally, as shown in fig. 1, the projection device may further include a galvanometer 70. The display control circuit 20 can also control the vibrating mirror 70 to vibrate, so as to sequentially project a plurality of image light beams obtained by modulating a plurality of frames of projection images to be displayed by the digital micro-mirror device to different positions of a projection plane through the projection lens 60. After the image light beams projected to different positions on the projection plane are displayed in a superposition mode, a target projection image can be formed. The projection plane may be a projection screen of the projection device, or may be a wall surface. The plurality of frames of projection images to be displayed may be obtained by processing the initial projection image by the display control circuit.
Fig. 3 is a flowchart of a method for displaying a projection image according to an embodiment of the present disclosure, where the method may be applied to a display control circuit of a projection apparatus, for example, the display control circuit 20 in the projection apparatus shown in fig. 1 or fig. 2. Referring to fig. 1, the projection device includes a light valve 50, and the light valve 50 may be a digital micromirror device including at least one first micromirror array and at least one second micromirror array. As shown in fig. 3, the method includes:
In the embodiment of the application, after receiving a projection image to be displayed, the display control circuit can perform image division on the projection image to be displayed so as to divide the image to be displayed into a first sub image group and a second sub image group which are arranged along a column direction. The first sub-image group comprises at least one sub-image corresponding to at least one first micro mirror array in a one-to-one mode, and the second sub-image group comprises at least one sub-image corresponding to at least one second micro mirror array in a one-to-one mode.
Wherein each sub-image comprises a plurality of rows of pixels, the row numbers of which increase line by line in a direction away from the origin of the image coordinate system in which the projected image is located. The image coordinate system has a horizontal axis parallel to the row direction and a vertical axis parallel to the column direction. In the image coordinate system, the scale on the horizontal axis may indicate a column number, and the scale on the vertical axis may indicate a row number. The origin of the image coordinate system may refer to the upper left vertex of the projected image to be displayed.
Optionally, the number of rows of pixels included in at least one sub-image in the first image group is the same as the number of rows of pixels included in at least one sub-image in the second image group, and the number of columns of pixels included in at least one sub-image in the first image group is the same as the number of columns of pixels included in at least one sub-image in the second image group. The number of rows and columns of pixels comprised by each sub-image is determined based on the resolution of the projected image to be displayed.
For example, referring to fig. 4, it is assumed that the resolution of the projected image to be displayed is 3840 × 2160, i.e. the projected image includes 2160 rows of pixels, each row of pixels including 3840 pixels. 3840 × 2160 resolution may also be expressed as 4 kilo (klo, K) resolution. As shown in fig. 4, the display control circuit may divide the projection image to be displayed into a first sub-image group a and a second sub-image group B arranged in the column direction. Each sub-image in each sub-image group comprises 1080 lines of pixels, each line of pixels comprising 1920 pixels, i.e. each sub-image has a resolution of 2K.
And 102, turning the first sub image group by taking an axis parallel to the row direction as a turning axis.
The flip axis may be a central axis parallel to the row direction in the first sub-image group. The first sub-image group is close to the origin of the image coordinate system in which the projection images are located relative to the second sub-image group of the two sub-image groups. The display control circuit changes the arrangement position of each row of pixels of each sub-image in the first sub-image group after the first sub-image group is inverted, compared with the arrangement position of the row of pixels before the inversion. And the arrangement position of each pixel row after the overturning is symmetrical to the arrangement position of the pixel row before the overturning along the overturning axis.
For example, referring to fig. 4, after the display control circuit flips the first sub-image group a, the pixel of the 1 st row of each sub-image in the first sub-image group a flips to the 1080 th row, and the pixel of the 1080 th row flips to the 1 st row.
And 103, reading the pixels in at least one sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data.
The first display data comprises data of a plurality of rows of pixels of each sub-image in the first sub-image group, and the data of the plurality of rows of pixels of each sub-image are arranged in the sequence of line numbers from small to large. Before the display control circuit does not vertically turn over at least one sub-image in the first sub-image group, the data of a plurality of rows of pixels of each sub-image are arranged in the sequence of line numbers from small to large.
It can be understood that the arrangement order of the data of the plurality of rows of pixels in the first display data read line by the display control circuit is the same as the arrangement order of the plurality of rows of pixels in at least one sub-image of each sub-image group in the projection image to be displayed received by the display control circuit.
And 104, in the process of reading the pixels in the first sub-image group line by line, reading the pixels in at least one sub-image in the second sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain second display data.
In the embodiment of the present application, in the process of reading the pixels in the first sub image group line by line, the display control circuit can read the pixels in at least one sub image in the second sub image group line by line in synchronization with the sequence from small to large of the line number of the pixels in at least one sub image in the second sub image group line by line to obtain the second display data. Thus, the display control circuit can read multiple rows of pixels of multiple sub-images in the projected image simultaneously. The second display data comprises data of a plurality of rows of pixels in each sub-image of the second sub-image group, and the data of the plurality of rows of pixels of each sub-image are arranged in the sequence of line numbers from small to large.
It can be understood that, after the display control circuit divides a frame of projection image to be displayed into the first sub image group and the second sub image group, the boundary area of the two sub image groups is the data alignment area of the two sub image groups. When the display control circuit reads the pixels of each sub-image in the two sub-image groups, the display control circuit needs to start reading (i.e. refreshing) with the data alignment area as a starting point. If the display control circuit does not perform the inversion processing on the first sub-image group, the display control circuit reads the first display data obtained by reading the first sub-image group, and the data of the multiple rows of pixels of each sub-image are arranged in a reverse order. For example, if the frame of the projection image to be displayed includes 2160 rows of pixels, the data alignment area is a boundary area of the 1080 th row of pixels and the 1081 th row of pixels. In first display data obtained by reading multiple rows of pixels of at least one sub-image in the first sub-image group by the display control circuit, the data of the multiple rows of pixels of each sub-image are arranged according to the sequence from the 1080 th row to the 1 st row.
In this embodiment, after the display control circuit inverts the first sub image group, the data alignment area of the two sub image groups is a boundary area of a pixel start line (i.e. line 1) of each sub image in the two sub image groups. After the display control circuit reads the data alignment area as a starting point, the data of a plurality of rows of pixels of each sub-image of the first sub-image group are arranged in a positive sequence in the obtained first display data. For example, in the first display data and the second display data, the data of the plurality of rows of pixels of each sub-image are arranged in the order of the 1 st row to the 1080 th row. Therefore, the arrangement sequence of a plurality of rows of pixels in the display data transmitted to the digital micro-mirror device by the display control circuit can be ensured to be consistent with the arrangement sequence of a plurality of rows of pixels in the projected image received by the display control circuit.
In this embodiment, after obtaining the first display data corresponding to the first sub-image group and the second display data corresponding to the second sub-image group, the display control circuit can transmit the first display data to at least one first micromirror array of the dmd and transmit the second display data to the at least one second micromirror array. The digital micromirror device can modulate a light beam emitted by a light source in the light source component into an image light beam based on the first display data and the second display data. The image beam is projected onto a projection plane through the projection lens, and then a projection image can be obtained.
It is understood that the digital micromirror device comprises a plurality of micromirrors arranged in an array, and the display control circuit controls the plurality of micromirrors in the digital micromirror device to flip to modulate the light beam emitted from the light source. In the related art, a display control circuit uniformly controls the turning of a plurality of micromirrors of a digital micromirror device. Accordingly, the digital micromirror device corresponds to only one frame of the projected image to be displayed. Therefore, when the display control circuit reads the pixels of the projected image, the display control circuit can only read the pixels of a plurality of lines in the projected image in sequence from small line numbers to large line numbers, and therefore the efficiency of reading the pixels of the projected image by the display control circuit is low.
In the embodiment of the present application, as shown in fig. 2 and 4, the digital micromirror device can be divided into a plurality of micromirror arrays (e.g., at least one first micromirror array and at least one second micromirror array). The display control circuitry in the projection device includes a plurality of DLP control circuits capable of zonal control of a plurality of micromirror arrays of the digital micromirror device. And the display control circuit can divide the projection image to be displayed into a plurality of sub-images which are in one-to-one correspondence with the plurality of micro mirror arrays, and read the pixels of the plurality of sub-images, so as to obtain the display data corresponding to each micro mirror array. Accordingly, each micromirror array in the digital micromirror device can modulate a light beam emitted from a light source based on its corresponding display data.
Based on the above analysis, the display control circuit can perform partition control on the digital micromirror device, and can turn over the divided first sub-image group, thereby implementing parallel processing on the sub-images or display data corresponding to multiple partitions (i.e., micromirror arrays) of the digital micromirror device. Accordingly, the display control circuit can simultaneously read a plurality of rows of pixels of the sub-images corresponding to the first micro mirror array and the second micro mirror array when reading the pixels of the projected image. Therefore, the efficiency of the display control circuit for reading the pixel of the projected image to be displayed is higher, and the efficiency of the digital micro-mirror device for modulating the image light beam is higher. And when the projection screen displays video, when the efficiency of modulating the image light beam by the digital micro-mirror device is high, the refresh rate of the multi-frame projection image in the video displayed by the projection screen is high. Therefore, the good display effect of the video can be ensured.
In summary, the embodiment of the present application provides a method for displaying a projection image, which is applied to a display control circuit of a projection device. The display control circuit is capable of dividing a projection image to be displayed into a first sub-image group and a second sub-image group and inverting the first sub-image group. Then, the display control circuit can read the pixels in each sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data, and synchronously read the pixels in each sub-image in the second sub-image group line by line to obtain second display data. Since the display control circuit can read the pixels of each sub-image in the first sub-image group and the second sub-image group at the same time, the efficiency of reading the pixels by the display control circuit is high. Based on this, the efficiency of the digital micro-mirror device for modulating the image light beam based on the first display data and the second display data is higher.
Fig. 5 is a schematic flowchart of another method for displaying a projected image according to an embodiment of the present disclosure, where the method may be applied to a display control circuit of a projection device, for example, the display control circuit 20 in the projection device shown in fig. 1. Referring to fig. 1, the projection apparatus includes a multimedia processing circuit 10, a light valve 50, and a galvanometer 70. The light valve 50 may be a digital micromirror device including at least one first micromirror array and at least one second micromirror array. As shown in fig. 5, the method includes:
In this embodiment of the application, after the initial projection image transmitted by the multimedia processing circuit is acquired, the display control circuit may process the initial projection image to divide the initial projection image into multiple frames of projection images to be displayed. The number of the multi-frame projection images obtained by dividing the initial projection image may be the same as the number of the vibrating directions of the galvanometer in the projection equipment, and the resolution of the multi-frame projection images may be the same. For example, if the galvanometer has 4 vibration directions, the display control circuitry may divide the initial projected image into 4 projected images of equal resolution.
Optionally, the display control circuit may process the initial projection image in a sampling and framing manner to obtain multiple frames of projection images to be displayed. For example, the display control circuit may first select a plurality of target pixels in the initial projection image, and then, for each target pixel, the display control circuit may extract pixels in alternate lines and/or alternate columns in the initial projection image with the target pixel as a starting point, so as to obtain a frame of projection image to be displayed.
For example, referring to fig. 6 and 7, assuming that the resolution of the initial projection image is 8K, the 8K resolution may also be denoted as 7680 × 4320, where 7680 × 4320 means that the initial projection image includes 4320 rows of pixels, each row including 7680 pixels. The display control circuit may take four pixels located in a first row and a first column, a first row and a second column, a second row and a first column, and a second row and a second column as target pixels. For each target pixel, the display control circuit can extract one pixel in every other row and every other column in the initial projection image with the target pixel as a starting point, so as to obtain a frame of projection image to be displayed.
Based on the above-described sampling framing operation, the display control circuit may divide pixels positioned in odd-numbered rows and in odd-numbered columns into projection images to be displayed (a), divide pixels positioned in odd-numbered rows and in even-numbered columns into projection images to be displayed (b), divide pixels positioned in even-numbered rows and in odd-numbered columns into projection images to be displayed (c), and divide pixels positioned in even-numbered rows and in even-numbered columns into projection images to be displayed (d). The resolution of the 4 frames of projection images to be displayed may be 4K.
In the embodiment of the application, after dividing the initial projection image into a plurality of frames of projection images to be displayed, the display control circuit can sequentially perform image division on each projection image to be displayed so as to divide the projection images to be displayed into the first sub image group and the second sub image group which are arranged along the column direction. The first sub-image group comprises at least one sub-image corresponding to at least one first micro mirror array in a one-to-one mode, and the second sub-image group comprises at least one sub-image corresponding to at least one second micro mirror array in a one-to-one mode. Each sub-image comprises a plurality of rows of pixels, the row numbers of which increase line by line in a direction away from the origin of the image coordinate system in which the projected image is located. The image coordinate system has a horizontal axis parallel to the row direction and a vertical axis parallel to the column direction. In the image coordinate system, the scale on the horizontal axis may indicate a column number, and the scale on the vertical axis may indicate a row number.
Optionally, the number of rows of pixels included in at least one sub-image in the first image group may be the same as the number of rows of pixels included in at least one sub-image in the second image group, and the number of columns of pixels included in at least one sub-image in the first image group may also be the same as the number of columns of pixels included in at least one sub-image in the second image group. The number of rows and columns of pixels comprised by each sub-image may be determined based on the resolution of the projected image to be displayed.
As shown in fig. 2 and 4, the display control circuit may include an AP and DLP control circuit. The AP may divide a frame of projection images to be displayed into a first sub-image group a and a second sub-image group B arranged in a column direction.
Alternatively, the digital micromirror device may include a number of at least one first micromirror array and a number of at least one second micromirror array that are equal. For example, the digital micromirror device can include two first micromirror arrays and two second micromirror arrays. Accordingly, each sub-image group may include two sub-images arranged in the row direction. That is, the display control circuit may divide the projection image to be displayed per frame into four sub-images. Referring to fig. 4, assuming that the resolution of the projected image to be displayed is 3840 × 2160 (i.e. 4K), i.e. the projected image to be displayed includes 2160 rows of pixels, each including 3840 pixels, the resolution of each sub-image may be 1920 × 1080 (i.e. 2K).
Optionally, at least one sub-image included in the first sub-image group may correspond to at least one sub-image included in the second sub-image group in a one-to-one manner. An overlapping area is formed between every two adjacent sub-images in the first sub-image group, an overlapping area is formed between every two adjacent sub-images in the second sub-image group, and an overlapping area is formed between each sub-image in the first sub-image group and a corresponding sub-image in the second sub-image group.
In the embodiment of the present application, when the display control circuit divides the projection image, in order to ensure that the image data of the divided sub-images can be aligned (i.e., ensure that the pixel rows and the pixel columns of the sub-images can be aligned), the display control circuit may set an overlap region between the sub-regions. The overlap region may also be referred to as a fusion region or a data alignment region.
For example, referring to fig. 4, if the first sub image group includes the sub image LT and the sub image RT, and the second sub image group includes the sub image LB and the sub image RB, the sub image LT corresponds to the sub image LB and the sub image RT corresponds to the sub image RB. The sub-image LT has an overlap region with the sub-image LB and the sub-image RT, respectively, the sub-image LB and the sub-image RB having an overlap region.
Alternatively, in a plurality of sub-images into which one frame of the projection image is divided, an overlapping area between two adjacent sub-images arranged in the row direction may include N columns of pixels. The overlapping region between two sub-images arranged in the column direction and adjacent to each other may include M rows of pixels. N and M are positive integers, N may be positively correlated with the number of pixel columns included in the sub-image, and M may be positively correlated with the number of pixel rows included in the sub-image. For example, if each sub-image includes 2260 rows and 3840 columns of pixels, the values of M and N may both be 32.
And step 203, turning the first sub image group by taking an axis parallel to the row direction as a turning axis.
The flip axis may be a central axis of each sub-image in the first sub-image group parallel to the row direction. The first sub-image group is close to the origin of the image coordinate system in which the projection images are located relative to the second sub-image group of the two sub-image groups. The display control circuit changes the arrangement position of each row of pixels of each sub-image in the first sub-image group after the first sub-image group is inverted, compared with the arrangement position of the row of pixels before the inversion. And the arrangement position of each row of pixels of each sub-image in the first sub-image group after being turned is symmetrical to the arrangement position of the row of pixels before being turned along the turning axis.
For example, referring to fig. 4, after the display control circuit inverts the first sub image group a, the pixel of the 1 st row of each sub image in the first sub image group a is inverted to the 1080 th row, and the pixel of the 1080 th row is inverted to the 1 st row.
And step 204, carrying out image processing on each sub-image in the first sub-image group and each sub-image in the second sub-image group.
In the embodiment of the application, after obtaining a plurality of sub-images of each frame of projection image, the display control circuit can perform image processing on the plurality of sub-images, so that the digital micromirror device can better modulate the image light beam. Wherein the image processing may comprise at least: and (5) converting the format. And, the image processing may further include: at least one of a brightness process, a sharpness process, a color process, and a geometric correction process.
It can be understood that the display control circuit performs brightness processing, sharpness processing, color processing and geometric correction processing on a plurality of sub-images of a projected image to be displayed, so that the image quality of the plurality of sub-images is better, and the digital micromirror device is convenient to modulate light beams emitted by the light source based on image data of the plurality of sub-images.
It can also be understood that the data format of the initial projection image received by the display control circuit is V-by-one, and the digital micromirror device can only modulate the image beam based on data in a high-speed serial interface (HSSI) format. Therefore, the display control circuit may perform format conversion on the plurality of sub-images of the projection image to be displayed after performing brightness processing, sharpness processing, color processing, and geometric correction processing on the plurality of sub-images to convert the data format of the plurality of sub-images into HSSI.
And step 205, reading the pixels in at least one sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data.
The first display data comprises data of a plurality of rows of pixels of each sub-image in the first sub-image group, and the data of the plurality of rows of pixels of each sub-image are arranged in the sequence of line numbers from small to large. Before the display control circuit does not turn over at least one sub-image in the first sub-image group, the data of a plurality of rows of pixels of each sub-image are arranged in the sequence of line numbers from small to large.
It can be understood that the arrangement order of the data of the plurality of rows of pixels in the first display data read line by the display control circuit is the same as the arrangement order of the plurality of rows of pixels in at least one sub-image of each sub-image group in the projection image to be displayed received by the display control circuit. Thereby, it can be ensured that the image content of the image beam that the digital micromirror device can modulate based on the first display data and the second display data is correct.
And step 206, in the process of reading the pixels in the first sub-image group line by line, reading the pixels in at least one sub-image in the second sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain second display data.
In the embodiment of the present application, in the process of reading the pixels in the first sub image group line by line, the display control circuit can read the pixels in at least one sub image in the second sub image group line by line in synchronization with the sequence from small to large of the line number of the pixels in at least one sub image in the second sub image group line by line to obtain the second display data. It follows that the display control circuitry is capable of independently reading multiple rows of pixels from each sub-image in the projected image. The second display data comprises data of a plurality of rows of pixels in each sub-image of the second sub-image group, and the data of the plurality of rows of pixels of each sub-image are arranged in the sequence from small row number to large row number.
It can be understood that, after the display control circuit divides a frame of projection image to be displayed into the first sub image group and the second sub image group, a boundary area of the two sub image groups is a data alignment area of the two sub image groups. When the display control circuit reads the pixels of each sub-image in the two sub-image groups, the display control circuit needs to start reading (i.e. refreshing) with the data alignment area as a starting point. If the display control circuit does not perform the inversion processing on the first sub-image group, the display control circuit reads the first display data obtained by reading the first sub-image group, and the data of the multiple rows of pixels of each sub-image are arranged in a reverse order. For example, if the frame of the projected image to be displayed includes 2160 rows of pixels, the data alignment area is the boundary area between the 1080 row of pixels and the 1081 row of pixels. In first display data obtained by reading multiple rows of pixels of at least one sub-image in the first sub-image group by the display control circuit, the data of the multiple rows of pixels of each sub-image are arranged according to the sequence from the 1080 th row to the 1 st row.
In this embodiment, after the display control circuit inverts the first sub image group, the data alignment area of the two sub image groups is a boundary area of a pixel start line (i.e. line 1) of each sub image in the two sub image groups. And after the display control circuit reads the data alignment area as a starting point, the data of a plurality of rows of pixels of each sub-image in the first sub-image group are arranged in a positive sequence in the obtained first display data. For example, in the first display data and the second display data, the data of the plurality of rows of pixels of each sub-image are arranged in the order of the 1 st row to the 1080 th row. Therefore, the arrangement sequence of the pixels of multiple lines in the display data transmitted to the digital micro-mirror device by the display control circuit is consistent with the arrangement sequence of the pixels of multiple lines in the projection image received by the display control circuit.
In the embodiment of the present application, the display resolution of each micromirror array included in the digital micromirror device may be the same, and the resolution of each sub-image included in the first sub-image group and the second sub-image group may also be the same. The display control circuit may detect whether the resolution of the sub-image is greater than the display resolution of the micro-mirror array after completing the image processing of the plurality of sub-images of the projected image. If the display control circuitry determines that the resolution of the sub-image is greater than the display resolution of the micro-mirror array, then the following step 208 may be performed. If the display control circuitry determines that the resolution of the sub-image is less than or equal to the display resolution of the micro-mirror array, then the following step 209 may be performed.
It will be appreciated that the digital micromirror device cannot modulate an image with a resolution greater than its display resolution. Therefore, before transmitting the first display data and the second display data to the dmd, the display control circuit should detect whether the resolution of the sub-image is greater than the display resolution of the micromirror array, so as to ensure that the dmd realizes the modulation of the image light beam.
And step 208, compressing the first display data and the second display data.
In the embodiment of the present application, the display control circuit may compress the first display data and the second display data if the resolution of the sub-image is greater than the display resolution of the micromirror array. The image resolution corresponding to the compressed first display data and the compressed second display data is less than or equal to the display resolution of the micro mirror array. The image resolution corresponding to the first display data refers to the resolution of each sub-image in the first sub-image group, and the image resolution corresponding to the second display data refers to the resolution of each sub-image in the second sub-image group.
For example, if the resolution of the digital micromirror device is 4K, and the digital micromirror device includes 2 first micromirror arrays and 2 second micromirror arrays, the display resolution of the 4 micromirror arrays is 2K. If the display control circuit detects that the image resolutions corresponding to the first display data and the second display data are both 4K, the first display data and the second display data may be compressed, and the image resolutions corresponding to the compressed first display data and the compressed second display data may be 2K.
In this embodiment, if the display control circuit determines that the resolution of the sub-image is less than or equal to the display resolution of the micromirror array, or if the display control circuit determines that the resolution of the sub-image is greater than the display resolution of the micromirror array, and compresses the first display data and the second display data, the display control circuit may transmit the first display data to at least one first micromirror array of the dmd and transmit the second display data to at least one second micromirror array. After receiving the first display data and the second display data, the digital micromirror device can modulate a light beam emitted by a light source based on the first display data and the second display data to obtain an image light beam of a projected image to be displayed.
Optionally, at least one first micromirror array of the dmd is capable of modulating light beams based on the first display data, and the image light beams modulated by the at least one first micromirror array correspond to at least one sub-image in the first sub-image group one to one. At least one second micro mirror array of the digital micro mirror device can perform light beam modulation based on second display data, and the image light beams obtained by the modulation of the at least one second micro mirror array correspond to at least one sub-image in the second sub-image group in a one-to-one mode.
It can be understood that the display control circuit may sequentially transmit the first display data and the second display data corresponding to the multiple frames of projection images to be displayed, which are obtained by dividing the initial projection image, to the digital micromirror device. The digital micromirror device can further perform modulation in sequence to obtain image light beams corresponding to the multiple frames of projection images to be displayed. The efficiency of the digital micromirror device for modulating the image light beam is high because the efficiency of the display control circuit for reading the pixels of the projected image to be displayed is high.
And step 210, controlling the vibrating mirror to vibrate so that the vibrating mirror projects image beams obtained by modulating the projection images of different frames by the digital micro-mirror device to different positions of a projection plane through the projection lens.
In the embodiment of the present application, the display control circuit can synchronously control the vibrating mirror to vibrate (i.e. deflect) in different directions when controlling the digital micromirror device to modulate the image light beam. When the vibrating mirror vibrates along different directions, the image light beams obtained by modulating the projection images of different frames by the digital micro-mirror device can be projected to different positions of a projection plane through the projection lens. Therefore, after the plurality of image light beams projected onto the projection screen are superposed and displayed, a target projection image can be formed. The projection plane may be a projection screen of the projection device, or the projection plane may be other planes such as a wall surface.
For example, assuming that the galvanometer has 4 vibration directions (for example, the galvanometer may vibrate in four directions of upper left, upper right, lower left, and lower right in a direction perpendicular to a placement plane thereof), in step 201 described above, the display control circuit may divide an initial projection image with a resolution of 8K into 4 frames of projection images to be displayed with a resolution of 4K. Then, the display control circuit can control the galvanometer to vibrate in 4 directions in sequence, so as to project the image light beams corresponding to the 4 frames of projection images to be projected, which are obtained by modulation of the digital micro-mirror device, to 4 positions of the projection plane through the projection lens. After the 4 image light beams on the projection plane are superposed and displayed, a target projection image with the resolution of 8K can be formed.
Alternatively, the projection plane may be a projection screen of the projection apparatus, and the 4 image light beams emitted by the projection lens may be projected to an upper left position, an upper right position, a lower left position and a lower right position of the projection screen in sequence. If the refresh rate of the projection screen is 60 hertz (Hz), that is, the projection screen can display 60 frames of target projection images within 1 second, the galvanometer can sequentially project image light beams corresponding to 4 frames of projection images to be projected to 4 positions of the projection screen through the projection lens within 1 \\ 60 seconds by vibrating.
It can be understood that the order of the steps of the method for displaying a projected image provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be increased or decreased according to the situation. For example, step 201 may be deleted according to the robbery situation. Alternatively, step 204 may be deleted as appropriate. Any method that can be easily conceived by a person skilled in the art within the technical scope of the present disclosure is also within the scope of the present disclosure, and thus, the detailed description is omitted.
In summary, the embodiment of the present application provides a method for displaying a projection image, which is applied to a display control circuit of a projection device. The display control circuit is capable of dividing a projection image to be displayed into a first sub-image group and a second sub-image group and inverting the first sub-image group. Then, the display control circuit can read the pixels in each sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data, and synchronously read the pixels in each sub-image in the second sub-image group line by line to obtain second display data. Since the display control circuit can read the pixels of each sub-image in the first sub-image group and the second sub-image group at the same time, the efficiency of reading the pixels by the display control circuit is high. Based on this, the efficiency of the digital micro-mirror device for modulating the image light beam based on the first display data and the second display data is higher.
The embodiment of the application provides a projection device, and the projection device is used for executing the display method of the projection image provided by the method embodiment. As shown in fig. 1, the projection apparatus includes: display control circuitry 20 and a light valve 50, the light valve 50 may be a digital micromirror device, referring to fig. 2 and 4, that includes at least one first micromirror array, and at least one second micromirror array. The display control circuit 20 is configured to:
the method comprises the steps that a projected image to be displayed is divided into a first sub image group and a second sub image group which are arranged along the column direction, the first sub image group comprises at least one sub image which is in one-to-one correspondence with at least one first micro mirror array, the second sub image group comprises at least one sub image which is in one-to-one correspondence with at least one second micro mirror array, each sub image comprises a plurality of rows of pixels, and the row numbers of the pixels of the plurality of rows increase line by line along the direction far away from the origin of an image coordinate system where the projected image is located.
And inverting the first sub image group by taking an axis parallel to the row direction as an inversion axis, wherein the first sub image group is close to the origin of the image coordinate system relative to the second sub image group.
And reading the pixels in at least one sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data.
And in the process of reading the pixels in the first sub image group line by line, reading the pixels in at least one sub image in the second sub image group line by line along the sequence of the line numbers of the pixels from small to large to obtain second display data.
And transmitting the first display data to at least one first micro mirror array, and transmitting the second display data to at least one second micro mirror array, so that the digital micro mirror device can modulate the projection image into an image light beam.
Optionally, at least one sub-image included in the first sub-image group corresponds to at least one sub-image included in the second sub-image group. The first sub image group comprises a first sub image group, a second sub image group and a third sub image group, wherein an overlapping area is arranged between every two adjacent sub images in the first sub image group, an overlapping area is arranged between every two adjacent sub images in the second sub image group, and an overlapping area is arranged between every two sub images in the first sub image group and a corresponding sub image in the second sub image group.
Optionally, the overlapping area between two adjacent sub-images arranged in the row direction includes N columns of pixels. The overlapping area between two adjacent sub-images arranged in the column direction includes M rows of pixels. The N and the M are positive integers, the N is positively correlated with the number of pixel columns included in the sub-image, and the M is positively correlated with the number of pixel rows included in the sub-image.
Optionally, the digital micromirror device comprises a number of at least one first micromirror array equal to a number of at least one second micromirror array.
Optionally, the display resolution of each micromirror array included in the digital micromirror device is the same, and the resolution of each sub-image included in the first sub-image group and the second sub-image group is the same. The display control circuit 20 is further configured to compress the first display data and the second display data if the resolution of the sub-image is greater than the display resolution of the micro mirror array.
Optionally, two first micromirror arrays and two second micromirror arrays are included in the digital micromirror device.
Optionally, the display control circuit 20 is further configured to perform image processing on each sub-image in the first sub-image group and each sub-image in the second sub-image group. Wherein the image processing comprises: format conversion, image processing further includes: at least one of a brightness process, a sharpness process, a color process, and a geometric correction process.
Optionally, as shown in fig. 1, the projection device further includes a multimedia processing circuit 10, and the display control circuit 20 is further configured to receive an initial projection image transmitted by the multimedia processing circuit 10. And processing the initial projection image to obtain a plurality of frames of projection images to be displayed, wherein the resolution ratios of the plurality of frames of projection images are the same.
Optionally, referring to fig. 1, the projection apparatus further includes a galvanometer 70 and a projection lens 60, and the display control circuit 20 is further configured to control the galvanometer 70 to vibrate, so that the galvanometer 70 projects image light beams obtained by modulating the projection images of different frames by the digital micro-mirror device to different positions of the projection plane through the projection lens 60.
In summary, embodiments of the present application provide a projection apparatus, in which a display control circuit is capable of dividing a projection image to be displayed into a first sub image group and a second sub image group and turning over the first sub image group. Then, the display control circuit can read the pixels in each sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data, and synchronously read the pixels in each sub-image in the second sub-image group line by line to obtain second display data. Since the display control circuit can read the pixels of each sub-image in the first sub-image group and the second sub-image group at the same time, the efficiency of reading the pixels by the display control circuit is high. Based on this, the efficiency of the digital micro-mirror device for modulating the image light beam based on the first display data and the second display data is higher.
It can be understood that the embodiments of the projection apparatus and the display method of the projected image provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the embodiments of the methods and are not described herein again.
The embodiment of the application provides a projection device, and the projection device comprises: a memory, a processor and a computer program stored on the memory, the processor when executing the computer program implementing the method of displaying a projected image (e.g. the method shown in fig. 3 or fig. 5) as provided in the above method embodiments.
The embodiment of the present application provides a computer-readable storage medium, in which instructions are stored, and the instructions are loaded and executed by a processor to implement the display method of the projected image (for example, the method shown in fig. 3 or fig. 5) provided by the above method embodiment.
Embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform a method of displaying a projected image as provided in the above method embodiments (e.g. the method illustrated in fig. 3 or fig. 5).
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
It is to be understood that the term "at least one" in this application refers to one or more, and the meaning of "a plurality" refers to two or more.
Reference herein to "and/or" means that three relationships may exist, for example, a and/or B may represent: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
In this application, the terms "first," "second," and the like are used for distinguishing identical or similar items with substantially identical functions and functionalities, and it should be understood that "first," "second," and "n" have no logical or temporal dependency, and no limitation on the number or execution order.
The above description is only exemplary of the application and should not be taken as limiting the application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the application should be included in the protection scope of the application.
Claims (10)
1. The display method of a projection image is characterized in that the display control circuit is applied to projection equipment, the projection equipment further comprises a digital micro-mirror device, and the digital micro-mirror device comprises at least one first micro-mirror array and at least one second micro-mirror array; the method comprises the following steps:
dividing a projection image to be displayed into a first sub image group and a second sub image group which are arranged along the column direction, wherein the first sub image group comprises at least one sub image which is in one-to-one correspondence with at least one first micro mirror array, the second sub image group comprises at least one sub image which is in one-to-one correspondence with at least one second micro mirror array, each sub image comprises a plurality of rows of pixels, and the row numbers of the plurality of rows of pixels are increased row by row along the direction far away from the origin of an image coordinate system where the projection image is located;
turning the first sub image group by taking an axis parallel to the row direction as a turning axis, wherein the first sub image group is close to the origin of the image coordinate system relative to the second sub image group;
reading the pixels in at least one sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data;
in the process of reading the pixels in the first sub image group line by line, reading the pixels in at least one sub image in the second sub image group line by line along the sequence of the line numbers of the pixels from small to large to obtain second display data;
and transmitting the first display data to the at least one first micro mirror array, and transmitting the second display data to the at least one second micro mirror array, so that the digital micro mirror device modulates the projection image into an image beam.
2. The method according to claim 1, wherein at least one sub-image included in the first sub-image group is in one-to-one correspondence with at least one sub-image included in the second sub-image group;
the first sub image group comprises a first image group, a second image group and a third image group, wherein an overlapping area is arranged between every two adjacent sub images in the first sub image group, an overlapping area is arranged between every two adjacent sub images in the second sub image group, and an overlapping area is arranged between every two sub images in the first sub image group and a corresponding sub image in the second sub image group.
3. The method according to claim 2, wherein the overlapping area between two adjacent sub-images arranged along the row direction comprises N columns of pixels;
the overlapping area between two adjacent sub-images arranged along the column direction comprises M rows of pixels;
the N and the M are positive integers, the N is positively correlated with the number of pixel columns included in the sub-image, and the M is positively correlated with the number of pixel rows included in the sub-image.
4. The method of any of claims 1 to 3, wherein the digital micromirror device comprises a number of the at least one first micromirror array equal to a number of the at least one second micromirror array.
5. The method according to claim 4, wherein the display resolution of each micromirror array included in the digital micromirror device is the same, and the resolution of each sub-image included in the first sub-image group and the second sub-image group is the same;
prior to transmitting the first display data to the at least one first micro-mirror array and the second display data to the at least one second micro-mirror array, the method further comprises:
and if the resolution of the sub-image is greater than the display resolution of the micro-mirror array, compressing the first display data and the second display data.
6. The method of claim 4, wherein the digital micromirror device comprises two first micromirror arrays and two second micromirror arrays.
7. The method according to any one of claims 1 to 3, wherein before reading the pixels in at least one sub-image of the first sub-image group line by line in descending order of the line number of the pixels to obtain the first display data, the method further comprises:
performing image processing on each sub-image in the first sub-image group and each sub-image in the second sub-image group;
wherein the image processing comprises: format conversion, the image processing further comprising: at least one of a brightness process, a sharpness process, a color process, and a geometric correction process.
8. The method of any of claims 1 to 3, wherein the projection device further comprises multimedia processing circuitry, the method further comprising:
receiving an initial projection image transmitted by the multimedia processing circuit;
and processing the initial projection image to obtain a plurality of frames of projection images to be displayed, wherein the resolution ratios of the plurality of frames of projection images are the same.
9. The method of any of claims 1 to 3, wherein the projection device further comprises a galvanometer and a projection lens, the method further comprising:
and controlling the vibrating mirror to vibrate so that the vibrating mirror projects image beams obtained by modulating the projected images of different frames by the digital micro-mirror device to different positions of a projection plane through the projection lens.
10. A projection device comprising a display control circuit and a digital micromirror device, the digital micromirror device comprising at least one first micromirror array and at least one second micromirror array; the display control circuit is configured to:
dividing a projection image to be displayed into a first sub image group and a second sub image group which are arranged along the column direction, wherein the first sub image group comprises at least one sub image which is in one-to-one correspondence with at least one first micro mirror array, the second sub image group comprises at least one sub image which is in one-to-one correspondence with at least one second micro mirror array, each sub image comprises a plurality of rows of pixels, and the row numbers of the plurality of rows of pixels are increased row by row along the direction far away from the origin of an image coordinate system where the projection image is located;
turning the first sub image group by taking an axis parallel to the row direction as a turning axis, wherein the first sub image group is close to the origin of the image coordinate system relative to the second sub image group;
reading the pixels in at least one sub-image in the first sub-image group line by line along the sequence of the line numbers of the pixels from small to large to obtain first display data;
in the process of reading the pixels in the first sub image group line by line, reading the pixels in at least one sub image in the second sub image group line by line along the sequence of the line numbers of the pixels from small to large to obtain second display data;
and transmitting the first display data to the at least one first micro mirror array, and transmitting the second display data to the at least one second micro mirror array, so that the digital micro mirror device modulates the projection image into an image light beam.
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| CN110602470B (en) * | 2019-09-20 | 2022-02-08 | 青岛海信激光显示股份有限公司 | Projection display system and control method thereof |
| CN113542701A (en) * | 2020-04-20 | 2021-10-22 | 青岛海信激光显示股份有限公司 | Projection display method and projection equipment |
| CN114007051B (en) * | 2020-07-28 | 2024-02-20 | 青岛海信激光显示股份有限公司 | Laser projection system and display method of projection image thereof |
| CN114245090A (en) * | 2021-12-28 | 2022-03-25 | 青岛海信激光显示股份有限公司 | Image projection method, laser projection apparatus, and computer-readable storage medium |
| CN115914596A (en) * | 2022-10-28 | 2023-04-04 | 青岛海信激光显示股份有限公司 | Projection equipment and display method of projection image thereof |
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